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Old 25th May 2017, 12:36 pm   #1
M0YAA-Dave
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Default 2SA950-Y Equivalent

Hi all, I've not been here for a while, new child + radio shack in pieces has caused an imbalance of available time.

Anyway, I am back. I have my dad's old FDK-750A multi 2m transceiver. A transistor has let go the magic wizard smoke. I've identified the part as TR27 and the part is a 2SA950-Y. A PNP Silicon transistor.

I've been hunting google for an equivalent part but wading through the random chinese websites and adverts has caused VGA blindness so I thought I'd ask here instead. I have a couple of PNP transistors in the draw of certain bits but the ones I can find a datasheet for are way off.

Regards

Dave
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Old 25th May 2017, 12:47 pm   #2
paulsherwin
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Default Re: 2SA950-Y Equivalent

It's a medium power PNP Si transistor and looks very like a BC327 or even a 2N2907. I can't see anything unusual about it so lots of types will probably be OK if the current rating is up to the job, especially if the circuit design isn't pushing the ratings.

If you need something with a bit more grunt there are lots of 2SB772s going cheap on eBay at the moment.

http://html.alldatasheet.com/html-pd.../1/2SA950.html
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Old 25th May 2017, 12:48 pm   #3
HamishBoxer
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Default Re: 2SA950-Y Equivalent

£1.78 for 5 on Ebay (2SA950)
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Old 25th May 2017, 4:22 pm   #4
M0YAA-Dave
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Default Re: 2SA950-Y Equivalent

Quote:
Originally Posted by paulsherwin View Post
It's a medium power PNP Si transistor and looks very like a BC327 or even a 2N2907. I can't see anything unusual about it so lots of types will probably be OK if the current rating is up to the job, especially if the circuit design isn't pushing the ratings.

If you need something with a bit more grunt there are lots of 2SB772s going cheap on eBay at the moment.

http://html.alldatasheet.com/html-pd.../1/2SA950.html
I think I have a couple of 2907s in the BoB.

Last edited by Station X; 25th May 2017 at 6:16 pm. Reason: Forum rule compliance.
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Old 25th May 2017, 7:29 pm   #5
ukcol
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Default Re: 2SA950-Y Equivalent

Click image for larger version

Name:	2sa.jpg
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ID:	143239

I suspect the "-y" is a pin-out version.
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Old 25th May 2017, 7:55 pm   #6
paulsherwin
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Default Re: 2SA950-Y Equivalent

No, it's the gain grouping. Y is the higher gain range, though still under 350. They have the standard Japanese leadout of e-c-b.

If replacing with a 2N2907, remember that the leadout is different, so a bit of knitting will be required
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Old 25th May 2017, 8:21 pm   #7
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Default Re: 2SA950-Y Equivalent

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Originally Posted by paulsherwin View Post
Y is the higher gain range, though still under 350.
Thanks Paul
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Old 25th May 2017, 8:25 pm   #8
M0YAA-Dave
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Default Re: 2SA950-Y Equivalent

Looks like a trip to the bits shop is in order. All I have in BoB is a 2N3906 and some unused OC83s.
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Old 25th May 2017, 9:19 pm   #9
paulsherwin
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Default Re: 2SA950-Y Equivalent

A 2N3906 won't be up to the job.
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Old 25th May 2017, 9:19 pm   #10
Philips210
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Default Re: 2SA950-Y Equivalent

Hi.

The hFE classification taken from a Fairchild data sheet is as follows:

O = 90 to 180
Y = 135 to 270
G = 200 to 400
L = 300 to 600

I assume this coding system is universal for Japanese transistors.

Regards
Symon
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Old 25th May 2017, 9:20 pm   #11
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Default Re: 2SA950-Y Equivalent

It's not universal, but it's widely used.
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Old 25th May 2017, 9:27 pm   #12
M0YAA-Dave
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Default Re: 2SA950-Y Equivalent

Quote:
Originally Posted by paulsherwin View Post
A 2N3906 won't be up to the job.
Yeah I know, that's why I said a trip to the shop is in order.
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Old 28th May 2017, 9:32 pm   #13
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Default Re: 2SA950-Y Equivalent

Quote:
Originally Posted by M0YAA-Dave View Post
I've identified the part as TR27 and the part is a 2SA950-Y. A PNP Silicon transistor.
TR27 has the function of a simple power-switch.
If the smoke's out perhaps so for a reason.
I would check with an ohm-meter the resistance from Collector of TR27 to ground.
If low or even shorted more smoke's on the way.
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Old 28th May 2017, 9:43 pm   #14
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Default Re: 2SA950-Y Equivalent

I agree, transistors of this type rarely fail in the absence of a more significant fault.
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